In addition to process control and coating, another very important condition for producing high-quality and high-grade color coated panel for household appliances is to select high-quality and qualified substrate. If there are defects on the surface of
the original plate, it is often difficult to make up for the defects by relying on a coating of more than 20 microns.
At present, in the actual production process of color panel for household appliances, the quality of the original panel has risen to be the most important problem affecting the final quality of the product because the process has been basically fixed. Following is an introduction of how to inspect the surface of the color coated panel of household appliances by hot-dip galvanizing, which is the most widely used substrate at present. Usually, the panel of household appliances should be checked and accepted according to the standard of no obvious surface defect. The common defects are: impression, roll print, roll mark, scratch, scratch after plating, air knife mark, zinc mark ripple. Zinc dregs, dirt (oil or other sewage), finishing flowers, feathers, creases, watermarks, zinc flowers, bright edges, zinc ash, etc.
Among the defects mentioned above, it is difficult to observe directly with the naked eye many obvious depressions or protrusions on the surface of strip steel due to the extrusion of foreign bodies in hot galvanizing line, but after painting, there will be spots of color difference on the impression part. Therefore, the incoming materials should be checked by oil stone grinding. The polishing inspection is carried out on the horizontal inspection platform. The lower surface and the upper surface should be separated. The polishing oil stone should be evenly laid on the steel plate. The polishing force should not be too heavy. After polishing the surface of galvanized sheet with oil stone, some very fine concave and convex spots will become dark spots or bright spots. It is easy to find out. Under the full light environment, the steel plate will be angled 30 degrees from the lateral and forward to the horizontal plane to check whether there are concave and convex marks or other undetectable defects on the surface. The inspection method of finding defects while polishing should be adopted. When suspected defects are found, marks should be made on the defects in time. If periodic imprinting is found, the distance between edge and two points should be measured, and the coil should not be closed for the time being.
Therefore, it is very necessary to choose a regular color coated plate manufacturer. Qianye new building materials have been engaged in color coated plate production for many years. They are of good quality and have rich experience. Welcome to buy them!